Xu J, Bai Y, Fan T, Zheng X, Cai Y. Expression, purification, and characterization of a membrane-bound D-amino acid dehydrogenase from Proteus mirabilis JN458.
Biotechnol Lett 2017;
39:1559-1566. [PMID:
28676939 DOI:
10.1007/s10529-017-2388-0]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2017] [Accepted: 06/19/2017] [Indexed: 11/30/2022]
Abstract
OBJECTIVES
To characterize a novel membrane-bound D -amino acid dehydrogenase from Proteus mirabilis JN458 (PmDAD).
RESULTS
The recombinant PmDAD protein, encoding a peptide of 434 amino acids with a MW of 47.7 kDa, exhibited broad substrate specificity with D -alanine the most preferred substrate. The K m and V max values for D -alanine were 9 mM and 20 μmol min-1 mg-1, respectively. Optimal activity was at pH 8 and 45 °C. Additionally, this PmDAD generated H2O2 and exhibited 68 and 60% similarity with E. coli K12 DAD and Pseudomonas aeruginosa DAD, respectively, with low degrees of sequence similarity with other bacterial DADs.
CONCLUSIONS
D-Amino acid dehydrogenase from Proteus mirabilis JN458 was expressed and characterized for the first time, DAD was confirmed to be an alanine dehydrogenase.
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